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Name
Exam V
Physics 2220
Armstrong
Spring 2010
This is Exam V for PHYS 2220. There are five equally weighted questions. You may use a calculator,
your 3x5 prepared card, but no other materials are allowed. Please write your answers on the sheets
provided. Have fun!
Some useful constants:
�0 = 8.85 × 10−12
e = 1.60 × 10−19
C2
N m2
C
me = 9.11 × 10−31 kg
1 eV
= 1.60 × 10−19 J
h = 6.63 × 10−34 J s
u = 1.6605 × 10−27 kg
1. (20 points) An electron is trapped in an infinite square well of width 10.0 nm. Find the wavelength
of photons emitted when the electron drops from the n = 5 state to the n = 1 state in this system.
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